Electric radiator



Mar. 3, 1925.

E. B. LENNlG ELECTRIC RADIATOR Filed Aug. 25, 1922 5 Sheets-Sheet 1 it, i

" ATTORNEYS.

IN ENTOR:

Mar. 3, 1925. 1,528,494

E. B. LENNIG ELECTRIC RADIATOR Filed Aug. 25, 1922 5 Sheets-Sheet 2 rpllnlll III/A 6G} INVENTOR: -M

ATTORNEYE Mar. 3, 1925.

E. B. LENNIG ELECTRIC RADIATOR Filed Aug. 25, 1922 5 Sheets-Sheet 5 INVENTOR:

glam-4nd f V ATTORNEYS.

Mar. 3, 1925.

1,528,494 E. B. LENNIG ELECTRIC RADIATOR Filed Aug, 25 1922 5 Sheets-Sheet 4 V ATTORN Mar. 3, 192s. 1,528,494

E. B. LENNIG 4 ELECTRIC RADIATOR Filed Aug. 25, 1922 5 Sheets-Sheet 5 o ww N-TQRM m a" 1 ATTORNEY'S.

" Patented Mar. 3, 1925.

UNITED STATES PATENT OFFICE.

EDMUND B. LENNIG, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO ELECTRIC RADI- ATOR & ENGINEERING 00., INC., OESAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

ELECTRIC RADIATOR.

Application filed August 25, 1922. Serial No. 584,176.

To all whom it may concern:

Be it known that I, EDMUND B. LENNIG,

a citizen of. the United States, residing in the city and county of San Francisco, State of California, have invented a new and useful Electric Radiator, of which the following is a specification.

My invention relates to .a novel construction and arrangement of an electric radiator, 'wherefrom a maximum amount of heat with a minimum amount of electric current is obtained, novel means being provided autopliatically to store heat or to provide latent eat.

A further object of my invention is the provision of novel means to simplify the replacement of one or all of the electric coils.

A further object of my invention is the provision of novel means automatically to control an electric radiator employing ther mostatic means in thermal communication with the radiator.

My invention further consists of a novel electric radiator, wherein a plurality of heating coils are submerged in the liquid contained in the radiator, means being provided for simultaneously energizing said coils to eflect the heating of said liquid to a predetermined maximum temperature, and for automatically de-energizing certain of said coils as the temperature increases to a maximum, means being further provided for intermittently energizing and tie-energizing the heating coils to maintain a substantially constant maximum temperature with a minimum consumption of electric energy.

My invention further consists of a novel electric radiator in which liquid hollow columns are in communication with each other and with a base chamber in which are located the heating coils for heating the liquid, novel means being provided for mounting the thermostatic device in thermal communication with the liquid in the radiator automatically to control the energizing and de-energizing of the heating coils submerged in the liquid.

My invention urther consists of a novel electric radiator in which are employed heating coils in electric circuit and thermal communication with a thermostatic device, in conjunction with means in said electric circuit at any de ired location for automatically controlling the operation of the electric radlator. v v

Another object of my invention is to devise an electrlcradiator in which a storage of heat or latent heat is obtained by means of clay products such as marbles or the like.

Other novel features of construction and advantage will hereinafter more clearly appear in the detailed description of my invention.

For the purpose of illustrating my invention, I have shown in the accompanying drawings certain forms thereof which are at present preferred by me, since the same will give in practice satisfactory and reliable results, although it is to be understood that the various iristr'umentalities of which my invention consists may 'be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described. I

Figure 1 represents a erspective View of an electric radiator embo ying my invention.

Figure 2 represents a front elevation of Figure 1. I

Figure 3 represents an end elevation of the left-hand end of the radiator seen in Figure 2.

Figure 4 represents an end elevation of the right-hand end of the radiator seen in Figure 2.

Figure 5 represents a vertical section on the'line 55 Figure 3.

Figure 6 represents on an enlarged scale a longitudinal sectional view, partly in elevation, of one of the heating elements;

Figure 7 represents a section on line 7-7 Figure 13 represents in detached position v a perspective viewiof the head and tubes containing the electric heating elements.

Figure 14 represents a perspective view of the upper air tube in detached position. Figure 15 represents a perspective view of the thermostat in detached position.

Figure 16 represents a perspective view of an insulating core. removed from the unit seen in Fig. 13. Figure 17 represents a WR- ing diagram showing the connections from the heating coils to the thermostat. Similar numerals of reference indicate corresponding parts. Referring to the drawings 1 designates my novel construction of electric radiator, the same comprising the radiator sections 2, which are of substan:

tially the same construction and are held in assembled position by the upper threaded nipples 3, and the lower enlarged threaded.

. other end. Within each tubing or casing 7 is inserted the hollow or tubular insulating casing 9, within which is contained the core or insulation 10, about which latter is wound the heating coil 11, the latter being contained between the insulating elements 9 and 10 and its outer terminals 12 and13 projecting as shown in Fig. 6, so as to enable the desired electrical connections to be made. As the construction and manner of assembling each of the heating coils with respect to their insulating core and casing is the same, a description of one will suflice for all. The core 10 is provided with the head 9", see Figures 6 and 16 and, as will be seen from the left of Figure 5, the head 9 projects a short distance beyond the tubing 7 and passes through a hole in an insulating disc or plate 14, in proximity to which is an outer insulating plate or disc 15 upon whlch the various electrical connections and binding posts are supported so as to be readily accessible, as will be understood from Figures 5 and 17.

The left hand ends of the plurality of outer casings or tubings 7, which constitute the enclosures for the heating elements are secured or brazed in the outer. wall- 16 of the head 17, which is mounted in the outer lower portion of the left hand radiator section 17", as will be understood from- Figure 5, the inner or' right hand portion of said head being of reduced diameter and threaded, as indicated at 18, so as to engage the lower contiguous portions of the outer left-hand sections so as to couple them together and form a seal to prevent liquid entering the-left-hand radiator section 17*, seen in Figure 5, a tight joint being effected by means of the gasket 16*.

I have shown the tubes. 7 containing the heating coils and their adjuncts as bei preferably six in number and by assembling them in the detachable head 17, the tubes and head and the heating coils within said tubes can be withdrawn and replaced as a unit, as will be understood from Figure 13, so that any tube and its heating coil 1s readily and instantly accessible for the purposes of inspection, replacement or repalr, as will be understood from Figure 13. The threaded ortion 18 serves to couple the two rightand end sections together and the shoulder and gasket 16 seen at the lower left hand portion of Figure 5 form an eifective seal to prevent leakage into the left-hand radiator section 17", which contains the thermostat and the wires leading one wire 27 leads to the member 28 of a thermostat 31 while the other wire 29 leads The current is to a binding post as 30 from which a wire corresponding to the wire 12 leads to one of the heating coils 11.

The thermostatic member 31 is located at the upper left hand portion of the radiator section 17 as seen in Figures 5, 9 and 10, and as the same is preferably constructed in conformity to the thermostat seen in my prior Patent No. 1,391,239, granted September 20, 1921, the construe: tion and operation of the same need not be described in great detail, as the manner of making the wiring connections will be readily apparent from my patent aforesaid and from Figure 17 wherein I have shown the collocation of the six heating coils and the wiring connections therefrom to the outer insulating disc. 15 and to the bottom member 28 of the thermostat 31, which is shown in detail in Figure 15.

The general construction of the thermostat 31 bestseen in Figure 15 is the same as that seen in my prior patent aforesaid, except that in lieu of arranging the thermostat blades six in a row, I have, for the sake of making the device compact for the purposes intended, arranged the thermostatic contact members 32 in two sets of three each, juxtaposed to and in alignment with each other, the contact arms 32 being parent brackets 38, and the connection of the wires 39 and 39 which afiord electrical communication from the two groups of six heating coils 11 to the thermostat 31 will be apparent to those skilled in the artfrom the wiring diagram seen in Figure 17 the modeof operation of the thermostat being apfrom the wiring diagram seen in Figure 7 of my Patent No. 1,391,329 and requiring no further detailed description. 4O designates a head having the threaded extension 41 which forms a coupling con nection for the upper left hand portions of the two left hand radiator sections, as will be understood from Figure 5, said head having the tubing 42 secured therein, the opposite end of said tubing being closed as indicated at 43, said tubing serving as an air tube and said upper head40, together with the lower head 17, serving as a closure to keep liquid out of the left hand radiator section 17", which is thus isolated from the other radiator sections, as will be understood from Figure 5. The air tube 42 is of less diameter than the nipples 3 as will be understood from Figure 5, so that the circulation of the liquid through the upper portion of the radiator is not impeded.

The outer or left hand of the air tube as seen in Figure 14 is constructed as seen in -Figure 14, so that by the application of a suitable wrench the tube can be screwed into place.

.The radiator sections, with the exception of the left hand section l7" seen in Figure 5, are filled with a suitable heating medium, such as oil, as indicated at 44, and each radiator section is also filled with clay spheres or marbles, as indicated at 45, contained within the radiator columns 46.

In equipping my novel radiator for the market, the parts are first assembled substantially as seen in Figure 5, with the oil or liquid heating element 44 suppliqd thereto and clay marbles 45. Before sealing up the openings, the electrical energy is turned into the coils and the liquid allowed to heat to a greater temperature with all of the coils in active use than under actual working conditions. As the heat increases in the T radiator, the liquid expands and the excess .of the liquid and air is allowed to drain or escape from the radiator. When the excess temperature, say 250 degrees Fahr. has been reached in testing the radiator, it is then sealed and allowed to cool. cooling, shrinks to its normal density, thus creating an empty space or vacuum in the radiator.

Thus, when the radiator is not in opera,- tion, it is under vacuum and when the radiator is in actual working use, the liquid does not create a pressure. The function of the vacuum is to enable the oil or other heating liquid element employed to circulate more freely and it will heat, as is known, more readily under vacuum than under pressure, whereby I am enabled to effect a considerable saving of electrical energy.

It will be apparent that by the employment of the clay products or marbles, 45, these marbles, being round, do not entirely fill the hollow columns in the radiator sections, but leave enough space for the liquid and in heating the liquid, ample spaceis assured for the circulation.

The function of these clay marbles is, first, to reduce the quantity ofoil that it would take to fill the hollow radiator columns, there being present a smaller quantity of liquid to heat, consequently it takes less electrical energy to bring the temperature of the heating element to the predetermined heat, thereby efiecting a saving in the cost of operation; second, it takes less electrical energy to kep a small amount of liquid at a predetermined temperaturethan it does a larger quantity, thus effecting a saving in the cost of operation; third, the clay products or marbles create a latent or storage heat, whereby I obtain without any additional expense, a saving of electrical energy and also acquire an additional amount of heat without any additional cost. when the electrical energy is turned off.

When the electrical energy is turned into the coils, the liquid heats to the pre-deters mined temperature and the marbles also absorb heat to the same temperature of the liquid, then when the electrical ener is turned off, if it were not for the mar les, this body of liquid would cool quickly.

The action on the temperature of the space heated is as follows The circulation of air around the radiator draws off the heat from the cast iron radiator and in doing this naturally cools the temperature of the liquid and due to the fact that we have present an inner column of. marbles or clay products, this liquid is supplied with additional heat, which under ordinary conditions does not occur.

I have found by actual tests,i.that'when the radiator is filled with oil only, it takes nearly one hour to heat up and 25 minutes to cool down to the temperature of the The liquid, in

space heated. When the marbles are also placed in the hollow columns of the radiator, it only takes 25 minutes to bring the radiator to the same temperature and one hour to cool down to the temperature of the room.

Special attention is called to the fact that by' the provision of the enlarged bottom chamber 5, I am enabled to employ larger tubes 7 to hold the cores 10 and their heating coils, thus increasing the heating surface of the coil holders which come in contact with the liquid, because it is well known that the larger the heating surface that comes in contact with any volume of liquid, -a greater economy is attained in the heating of said volume of liquid.

From my novel construction of coil holder, it will be evident that any one or more of the coils 11 can be replaced without a total loss of the entire heating unit or element and one or more'of the coils can be readily detached for inspection, replace .ment or repair, which is a very important feature affecting the tenance.

It will be understood from the foregoing that by my present invention, I have devised an electric radiator adapted to contain a suitable liquid which is subjected to the action of a heating unit comprising a plurality of heating coils and that by using a clay product in conjunction with liquid used, a storage of heat or latent heat is obpractical cost of maintained.

These coils are so arranged as to be energized and de-energized step by step by individual thermostats controlled by the temperature ofthe liquid and adjusted to be cut out'at different degrees of temperature, so that the radiator can be accurately and automatically controlled within predetermined ranges of temperature and will be automatically controlled in such a manner that any predetermined temperature can be maintained with a minimum consumption of electric current.

The upper portion of the left-hand radiator section 17 is provided with a suitable detachable case 47 provided with a front cover 48, so that on the removal of,

said case the thermostat 31 and air tube 42 are readily accessible.

Upon the removal of the bottom plate 24, the head 17 and tubes 7, comprising the heating unit 6 are readily. accessible, as is evident, so that all the parts of my novel radiator are convenient of access at all times. e

It will be furtherunderstood from the foregoing that I have devised an electrical radiator adapted to contain -a suitable liquid, which is subjected to the action of a'heating unit comprising a plurality of heating coils, which are arranged to be ener ized and de-ener 'zed ste b ste b individual thermostst s contrglled by thii temperature of the liquidv and adjusted to be cut out at different degrees of temperature so that the radiator can be accurately 7:.- and automatically controlled within predetermined ranges of temperature and will be automatically controlled in such a manner that any predetermined temperature can be maintained with a minimum con sumption of electrical current.

The field of usefulness of this heating system is very large and it can be installed wherever an electric service line is available. In a house containing small apartments, one ineach apartment will be sulficient. This system renders it unnecessary to employ heaters in the basement and to employ pipingjn the basement and through the walls and under the floorsof the build ing. There is nothing-tofreeze up or leak. It is absolutely noiseless in action. Flues or. vents are not needed. The expenses incident to employing a janitor 'or engineer and the consumption of fuel, wood, oil or gas are dispensed with, as well as the attendant dirt and dust from such operation. It is available for immediate use at any time of the year and at any time of the day or night. It is optional with every occupant of the house in every separate room to have heat or be without it as he desires. Each tenant pays for what he gets and no more. The owner is relieved from any annoyance or expense These are a few of the advantages in an apartment house, and these advantages apply also to any habitation of man.

It can be installed in a tent, a camp, a bunkhouse in the woods, on a ship,.in the m5 basement or attic, in the depths of a mine or tunnel, in a palace or a hovel, in a bungalow, a cottage, a farmhouse, a summer camp in the mountains, a garage, a barn,-a store or oifice, and other places too numerous to mention in detail. The radiator is portable and can be plugged in any light socket and it can be manually transported and used by the owner wherever the occasion requires. 1 15 The cost of operation is about twenty five watts per hour to each square foot of radia- Jon tion, and in this climate the cost to heat radiating surface to warm a given space.

While I have referred to the liquid heating element as being preferably oil and to the spherical heating elements as being clay marbles, it will be apparent that other equivalent liquid and solid heating elements may be employed without departing from the spirit of my invention.

It will now be apparent that I have devised a novel and useful electric radiator which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and

while I have in the present instance, shown and described a preferred embodiment thereof which will give in practice satisfactory and reliable results, it is to be understood that such embodiment is susceptible of modification in various particulars withoutdeparting from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination in an electric radia tor of a hollow body adapted to receive a liquid heating element, an electric heater in said body having heating coils, and a thermostat for each coil and in electrical communication with it automatically to suc cessively control the energizing and de-energizing thereof, said thermostats being carried by said body in position to be subject to and controlled by variation in temperature of said liquid heating element.

2. The combination in an electric radiator, of a hollow body adapted to receive a liquid heating element, an electric heater in said body having heating coils, a chamber carried by said body in proximity to said liquid element, and a thermostat for each coil and in electrical communication with it automatically to successively control the energizing and (le-energizing thereof; said thermostats being disposed in a chamber and out of communication with said liquid.

3. The combination in an electric radiator, of hollow sections adapted to receive a liquid, an electric heater in the lower portion of said sections having heating coils, a chamber in one of said sections in proximity to said liquid, a thermostat in said chamber for each coil and in electrical communication with it through wires in an exterior conduit automatically to succes-.,

. sively control the energizing and de-energizing thereof, and upper and lower heads forming coupling devices for two end sections, said heads serving to isolate said thermostat chamber from said liquid.

4. An electric radiator, comprising a hollow base and columns rising therefrom, said base and columns beingv adapted to receive a liquid, an electric heater in said base comprising a plurality of inclosed heating coils and a thermostat for each'coil and in electrical communication automatically to successively control the energizing and deenergizing thereof, said thermostat being controlled by the variation in temperatu e of the liquid in one of said columns.

5. An electric radiator, comprising 'a liquid containing body portion, heating coils within said body portion, an enclosing casingfor said coils, and individual thermostats in electrical communication with saidcoils to successfully control the energizing and de-energizing of each of said coils, and means to cause said thermostats to de-energize difi'eren't coils at different degrees of temperature of said liquid.

6. An electric radiator, comprising a liquid containing body portion having an aperture therein, a casing having one end open andthe other closed, and extending through said aperture into the liquid, an insulating plate closing the open end of said casing, means to seal said casing with respect to said body portion, heating coils within said casing, and thermostats controlled by the temperature of the liquid and independently and successively controlling the heating coils to close or open the circuit thereof.

7. An electric radiator comprising a liquid containing body portion having an aperture thereinto, a casing having one end open and the other closed, and extending through said aperture into the liquid, an insulating plate closing the open end of said casing, means to seal said casing with respect to said body portion, heating coils Within said casing, and thermostats controlled by the temperature of the liquid and independently and successively controlling the heating coils to close or open the circuit 0 thereof.

8. An electric radiator comprising a hollow base, hollow communicating radiator columns supported on said base, a heater supported in said base and comprising a plurality of heating coils insulated from each other, a chamber at the upper portion of said radiator colunms and in thermal communication with the liquid in a radiator column, and thermostatic means in said 5 chamber and in electrical communication with said coils, said thermostatic means including a lurality of switches and a plurality of t ermostat blades.

9. An electric radiator comprising a hollow base, hollow communicating radiator columns supported on said base, a heater consisting of a plurality of heating coils insulated from each other and located 111 said base, means for sealing said heating 1'25 coils, a chamber located at the upper portion'of said radiator columns and in thermal communication with the liquid in the radiator columns, thermostatic means n said chamber, consisting of a main electric 13 circuit including independent circuits, a plurality of switches, and a plurality of thermostat blades, and means for varying the thermal adjustment of said switches with respect to said thermostat blades.

10. The combination in an electric radiator of a hollow body adapted to receive a liquid heating element, an electric heater in said body having heating coils, and a thermostat for each coil and in electrical communication with it automatically to control the energizing and de-energizing thereof; said thermostats being carried by said body in position to be subject to and controlled by. variation in temperature of said llquid heating element, in combination with refractory spheres positioned in said body to absorb and retain 'heat from said liquid element.

11. The combination in an electric radiator, of a hollow body adapted to receive a liquid heating element, an electric heater in said body having heating coils, a chamber carried by said body in proximity to said liquid element and a thermostat for each coil and in electrical communication with it automatically to controlthe ener gizing and-de-energizing thereof; said thermostats being disposed. in a chamber and out of communication with said liquid, in combination with refractory bodies located in said hollow body.

12. The combination in an electric radiator, of hollow sections adapted to receive a liquid, an electric heater in the lower portion of said sections having heating coils, a chamber in one of said sections in proximity to said liquid, a thermostat in said chamber for each coil and in electrical communication with it through wires in an exterior conduit automatically to control the energizing and deenergizing thereof, and upper and lower heads forming coupling devices for two end sections, said heads serving to isolate said thermostat chamber -from said liquid, in

combination with refractory bodies located in said liquid. 7

13. An electric radiator, compiising a hollow base and columns rising therefrom, said base and columns being adapted to receive a liquid, an electric heater in said base comprising a plurality of inclosed heating coils, and a thermostat for each coil and in electrical communication with it automatically to control the. energizing and deenergizing thereof, said thermostat being controlled by the variation in temperature of the liquid in one of said'columns. in combination with refractory spheres located in I said base and columns.

14. An electric radiator, comprising a liquid containing body portion, heating coils within said body portion, an enclosing casing for said coils, and individual thermohollow base,

stats in electrical communication with said coils to control the energizing and de-energizing of each of said coils, and means to cause said thermostats to de-energize difwithin said casing, clay marbles contained in said liquid, and a thermostat controlled by the temperature of the liquid and independently controlling each heating coil to close or open the circuit thereof. 7 v

' 16. An electric radiator, comprising a liquid containing body portion having an aperture thereinto, a casing having one end open and the other closed, and extending through said aperture into the liquid, an insulating plate closing the open end of said casing, means to seal said casing with re spect to said body portion, heating coils within said casing, and a thermostat controlled by the temperature of the liquid and independently controlling each heating coil to close or open the circuit thereof, in combination with refractory bodies located in said body portion and surrounded by said liquid.

17. An electric radiator, comprising a hollow base having upwardly projecting hollow colunms supported above said base, a heater casing .withinsaid base, means to efi'ect a seal between said casing and base, heating coils within said casing, and thermostatic means operatively connected with said coils and responsive to variations in temperature of the liquid to control said heating coils, in combination with refractory bodies located in said hollow base and columns.

18. An electric radiator, comprising a hollow body, hollow communicating radiator columns supported on said body, said body member having a liquid chamber in communication with said radiator columns,

heating coils submerged in the liquid in said chamber, and a thermostatic device in thermal communication with said liquid and in electrical connection with said heating coils automatically to control them, in combination with refractorybodies located insaid hollow base and hollow columns.

19. An electric radiator comprising a columns supported on said base, a heater supported in said base and comprising a plurality of heating coils insulated from each other, a chamber at the upper portion of said hollow communicating radiator 'and' thermostatic means in said chamber and in electrical communication with said coils, said thermostatic means including a plurality" of switches, and a" plurality of thermostat blades, in combination with refractory bodies located in said hollow base and columns.

hollow base, hollow communicating radiator 20. An electric radiator comprising a columns supported on said base, avheater consisting of a plurality of heating coils insulated from each other and located in said base, means for sealing said heating coils, a chamber located at the upper portion of said radiator columns and in thermal communication with -the liquid in the radiator columns, thermostatic means in said casing, consisting of a main electric circuit including independent circuits, a plurality of switches, and a plurality of thermostat blades, and means for varying the thermal adjustment of said switches with respect to said thermostat blades, in combination with refractory bodies located in said hollow base and columns.

21. An electric radiator comprising a plurality of sections, all of the latter except an end section being filled with a liquid heating element, means for isolating said end section from the other sections, and means for electrically heating said element, in combination with a thermostat located in said isolated end section and electrical connections also contained in said isolated section from the electric heating means to said thermostat.

22. An electric radiator comprising a plurality of sections, all of the latter except an end section being filled with a liquid heating element and clay marbles, means for isolating said end section from the other sections, and means for electrically heating said liquid element and marbles, in combination' with a thermostat located in said isolated end section, and electrical connections also contained in said isolated section from the electric heating means to said thermostat.

23. An electric radiator comprising a plurality of sections all excepting an outer section being adaptedto, receive a liquid heating element, an air tube arranged in said sections closed at one endand open atthe other and provided with a, threaded head I adaptedto couple the upper portion of two outer sections together, a heating unit containing electric heating coils and having a threaded head coupling the lower portion of said two outer sections together, and a liquid heating element contained'in said sections except the outer section, the latter being isolated from the other sections, in combination with thermostats contained in said isolated section, and connections from said electric heating coils to said thermostats automatically to control the energizing and deenergizing ofeach coil, said thermostats belng subject to and controlled by variations in temperature of said liquid heating element.

24. An electric radiator comprising a plurality of sections all excepting an out r section being adapted to. receive a liquid heating element, an air tube arranged in said sections closed at one end and open at tln other and provided with a threaded head adapted to couple the upper portion of two outer sections together, a heating unit containing electric heating coils and having a threaded head coupling the lower portion of said two outer sections together, and a li uid heating element contained in said sections except the outer section, the latter being isolated from the other sections, in combination with clay marbles contained in said liquid element and adapted to store latent heat, thermostats contained in said isolated section and connections from said electric heating coils to said thermostats automatically'to control the energizing and deenergizing of said coils, said thermostats being subject to and controlled by variations in temperature of said liquid heating element.

25. In an electric radiator, a plurality of bottom of said sections, an electric heatingunit located in said chamber at the bottom of said sections and comprising a head having a plurality of tubes open at their outer ends and closed at their inner ends, insulating linings for each of said tubes, an insulating core contained in each of said linings, a heating coil wound around each of said cores and contained between said linings and cores, an insulating disk placed against the outer surface of said head and having the outer ends of said cores passing therethrough, an outer insulating disk through which the terminals of said coils pass, binding posts on said outer disks, means for isolating the outer radiator section from theupper and lower portions of said sections,

the lower coupling devices being of greater area than the upper coupling devices, whereby an enlarged chamber is formed at the bottom of said sections, an electric heating unit located in said chamber at the bottom of said sections and comprising a head having a pluraliy of tubes open at their outer ends and closed at their inner ends, insulat- 1ng linings for each of said tubes, an msulatlng corecontained in each of said 11nings, a heating coil. wound around each of said cores and contained between said linings and cores, an insulating disk placed against the outer surface of said head and-- having the outer ends of said cores passing therethrough, T an outer insulating disk through which the terminals of said coils pass, binding posts on said outer disks, means for isolating the outer radiator sec-1 tion from the other sections, thermostats contained in said outer isolated section, connections from each of said heating coils and binding poststosaid thermostats, said connections, insulated disks and head being also contained in said outer isolated section, and

liquid heating elements contained in said radiator sections. except said isolated section, said elements comprising a liquid and clay marbles contained in said liquid, said thermostats being subjected to and controlled by the variations in temperature of said heating elements.

27. In an electric radiator, a plurality of sections coupled together and provided with an enlarged chamber at the bottom, an electric heating element positioned in said chamber and comprising a head having tubes open at one end and closed at the other ends secured therein, an insulating lining for each of said tubes, an insulatin core for each of said tubes, a heating coi mounted on each of said cores, an inner insulatin disk in proximity to the outer portion 0 said head through which the outer ends of said cores pass, an outer insulating disk abuttingthe outer ends of said cores and provided with binding posts said coils be ing connected to said bindi n5 posts, an outer radiator section isolate mm the other radiator sections and provided with thermostats, connections from said binding mostats, said air tube and head having threaded portions serving as couplings for the two outer radiator sections, and a liquid heating element located in all of said sections except the outer isolated section.

28. In an electric radiator, a plurality of sections coupled together and provided with being connectedto said binding posts, an

outer radiator section isolated from the other radiator sections and provided with thermostats, connections from said binding posts to said thermostats, an air tube open at one end and closed at the other and having its open end in proximity tosaid thermostats, said air tube and head having threaded portions serving as couplings for the two outer radiator sections, and heating elements in all of said sections except the outer isolated section composed of a liquid and clay marbles in'said liquid for creating latent heat.

29. In an electric radiator, a plurality of radiator sect-ions coupled together and provided with an enlarged chamber at the bottom, an electric heating element in said bottom chamber and comprising a head having tubes therein open at one end and closed at their other ends, an insulating lining for each of said tubes, an insulating core for each of said tubes, a heating coil on each of said cores, an inner insulating disk in proximity to the outer portion of said head through which the outer ends of said cores pass, a second outer insulating disk abutting against the outer ends of said cores and provided with binding posts, said coils being connected to said binding posts, an outer radiator section isolated from the other radiator sections and provided with thermostats, connections from said binding posts contained in said isolated section and leading to said thermostats, an air'tube open at one end and closed at the other and having its open end in proximity to said thermostats, the outer end of said air tube serving as a coupling for the two-outer radiator sections. a liquid heating element contained in all of said sections except the outer isolated section, and clay marbles contained within said radiator sections and sur rounded by said liquid heating element.

30. .In an electric radiator, a. plurality of radiator sections coupled together and provided with an'enlarged chamber at the bottom, an electric heating element in said bottom chamber and comprising a head having tubes therein open at one end and closed at the other ends, an insulating lining for ea h of said tubes, an insulating core for each of said tubes, a heating coil on each of said cores, an inner insulating disk in proximity to the outer portion of said head through which the outer ends of said cores pass, a second outer'insulating disk. abuttin against the outer ends of said cores an provided with binding osts, said coils being connected to said bin ing posts, an outer radiator section isolated from the other radiator sections and provided with thermostats, connections from said binding osts contained in said isolated section and eading to said thermostats, an air tube open at one end and closed. at the other and having its open end in proximity to said thermostats, the outer end of said air tube serving as a coupling for the two outer radiator sections, a liquid heating element contained in all of said sections except the outer isolated section, and clay marbles contained within said radiator sections and surrounded by said liquid heating element, in combination with a bottom removable plate giving access to said disks and binding posts, and an upper removable case giving to said thermostats.

31. An electric radiator composed of a plurality of sections coupled together, said sections having an enlarged chamber formed at the lower portion thereof, an electric heatingunit positioned in said chamber and comprlsing a head, and tubes provided with closed ends projecting from said head into.

said chamber, heatin coils contained within said tubes and insu ated therefrom, means for isolating an outer section of said radiator from the other sections, thermostats contained in said isolated section, a liquid heating element in all of said sections except said isolated section, connections from each of said heating coils to said thermostats, a closure at the upper portion of said .outer section for giving access to said thermo stats, a closure at the lower portion of said section for giving access to'said head and heating coils, and an air tube closed at one end and open at the other located in the upper portion of said radiator (sections.

EDMUND B. LENNIG.

Witnesses:

F. J. MEINCKE, Russnnn L. THOMSON. 

